Roll src/tools/swarming_client/ 486c9b53c..f78187ab7 (16 commits)

https://chromium.googlesource.com/infra/luci/client-py.git/+log/486c9b53c4d5..f78187ab7712

$ git log 486c9b53c..f78187ab7 --date=short --no-merges --format='%ad %ae %s'
2018-10-19 bradhall Add optional-dimension argument to swarming
2018-10-08 robertocn [run_isolated] Replace parameters in environment variables.
2018-09-28 borenet Fix symlink bug in file_path.set_read_only()
2018-09-24 maruel [client] improve NamedCache logging
2018-09-24 maruel [client] fix unit test on macOS
2018-09-10 maruel [client] Enforce missing named cache hints
2018-09-04 brucedawson Print precise instructions on collecting swarming results
2018-09-04 maruel [client] fix condition for object
2018-08-31 brucedawson Update README.md with contribution instructions
2018-08-31 brucedawson Print details when kill(9) fails
2018-08-29 maruel [client] Implement the bot side of named cache size hint
2018-08-10 maruel [client] round time in LRU at the second
2018-08-08 maruel [client] uninstall in reverse order
2018-08-03 maruel [client] stop trimming cache in run_isolated
2018-08-01 maruel client: Add Cache.save()
2018-07-25 maruel [client] Overhaul temporary directory override in run_isolated

Created with:
  roll-dep src/tools/swarming_client

Bug: 871453
Change-Id: I6ab8a24b99a1424e4ed30835cb75ac14b116507f
Reviewed-on: https://chromium-review.googlesource.com/c/1291779Reviewed-by: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Commit-Queue: Brad Hall <bradhall@google.com>
Commit-Queue: Marc-Antoine Ruel <maruel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601233}

DEPS

@@ -118,7 +118,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling swarming_client
   # and whatever else without interference from each other.
-  'swarming_revision': '486c9b53c4d54dd4b95bb6ce0e31160e600dfc11',
+  'swarming_revision': 'f78187ab77127de42555afe0ad410bebde6ac6a5',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling ANGLE
   # and whatever else without interference from each other.